Which molecule/ion out of the following does not contain unpaired electrons?
(i) N{_{2}}^{+}
(ii) O_{2}
(iii) O{_{2}}^{2-}
(iv) B_{2}

 

Answers (1)

The answer is the option (iii) O{_{2}}^{2-}

Explanation:

The molecular orbital configuration of O{_{2}}^{2-} ion is

KK\sigma (2s)^{2}\sigma *(2s)^{2}\sigma (2p_{z})^{2}\pi (2p_{x})^{2}\pi (2p_{y})^{2}\pi *(2p_{x})^{2}\pi *(2p_{y})^{2}

Where,KK represents non-bonding molecular orbital of 1s orbital; thus, O{_{2}}^{2-} possesses no unpaired electrons.

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